From: Nigel Taylor (nigel_taylor@xxxxxxxxxxx)
Date: Fri Mar 02 2001 - 08:35:28 GMT-3
Dustin,
The ISL standard I believe as Horward pointed out recently was
that cisco was at one time a technology driven company and did a lot of work
in being the driving force behind a lot of standards. If I'm not mistaken
dot1q was basically derived from the existing ISL standard but is platform
independent. ISL however is Cisco specific and as someone mentioned on the
list quite possibly a few vendors support it as well. I know one of the
issues with dot1q as compared to ISL was the limitation of one Spanning-tree
process per implementation, where ISL does an instance of STP per vlan. I
do believe however that 802.1q committee has a revision of another specific
implementation(PVST+) that now support this function.
As far as the port requirements no there're still the same.. 100 MB
connection is a must. At least with the current cisco and standards body
implementation.
HTH
Nigel.
----- Original Message -----
From: Dustin L LaMascus <lamascus@xs4all.nl>
To: Ccielab <ccielab@groupstudy.com>
Sent: Friday, March 02, 2001 5:37 AM
Subject: dot1q Encap
> What about dot1q? can a 2500/1600 do this over a 10Mb Ethernet?
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
Nigel
> Taylor
> Sent: Friday, March 02, 2001 10:51 AM
> To: Wang, Zhan; ccielab@groupstudy.com
> Subject: Re: ISL encapsulation
>
> Zhan,
> The lowest model cisco router to support ISL is the 2600
model.
> One thing to note is that ISL requires a Fast Ethernet port. There was a
> thread on this a couple of weeks back. Basically this sums it all up.
>
> HTH
>
> Nigel..
>
> ----- Original Message -----
> From: Wang, Zhan <zhan.wang@intel.com>
> To: <ccielab@groupstudy.com>
> Sent: Friday, March 02, 2001 4:26 AM
> Subject: ISL encapsulation
>
>
> > Hi,
> >
> > anyone here knows if the eth subinterface of the 3620 or 2611support ISL
> or not? the version of my router is 11.3, seems not support it.
> >
> > thanks
> > Zhan
> >
> >
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